import java.util.HashMap;
import java.util.HashSet;

/**
 * Created by MGL on 2017/4/21.
 */
public class Test {
    public static void main(String[] args) {
        HashSet<User> set = new HashSet<>();
        User user1 = new User("123", "zhangsan", 11);
        User user2 = new User("123", "zhangsan", 11);
        System.out.println(set.size());
    }
}
